Question
A thermodynamic cycle of 1 mole ideal monatomic gas goes through 4 reversible steps (A to D ) as shown in the figure blew.
\ A thermodynamic cycle of 1 mole ideal monatomic gas goes through 4 reversible steps\ (A to
D
) as shown in the figure blew. Step
A
(state
1->2
) is adiabatic. Step
B(2->3)
is at\ constant volume. Step
C(3->4)
is adiabatic and
D(4->1)
is at constant volume. Give your\ answer in SI units and 2 decimal places. Hint: use
R
insteod of
k_(B)
since
n=1
mole. (10\ points total)\ The Following are known:
T1=330K,T3=400K,W_(sys )(A)=+374.13J
\ a) For
stepA(1->2)
, the system work
W_(sys)
is given above. What is the temperature of\ state
2,T_(2)
? What is the system
q,\\\\Delta U
and
\\\\Delta S
? (3 pts)\ b) For step
B(2->3)
, what is the system
q,\\\\Delta U
and
\\\\Delta S
?
T_(3)
is given above. Note that
T
is\ not a constant in this step! To derive
\\\\Delta S
, use the definition
\\\\Delta S=\\\\int (dq)/(T)
and
dq=dU
\ for a constant volume process. (4 pts)\ c) What is the change of system entropy
\\\\Delta S
for step
D(4->1)
? What is the system\ temperature at state
4,T_(4)
? (3 pts)
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